6221NSKBall

Name: NSK 6221 Ball Bearing
Brand: NSK
SKU: 6221

6221 is a NSK ball bearing, bore 105 mm, O.D. 190 mm, width 36 mm, dynamic rating 29,900 lbs. Dimensions, drawing, interchanges and price.

Request a quote WhatsApp Email us Search the catalog

Bore d105mm

Outside dia. D190mm

Width B36mm

Dynamic Cr29,900lbs

Static C0r23,500lbs

Limiting speed3,400rpm

Weight3.697kg

Cr / C0r1.27

Mean dia. dm147.5mm

Original catalogue drawing - NSK catalogue, page 17

Scanned from the manufacturer catalogue page listing this part number. All part numbers printed on that table share the same drawing.

Scale cross-section

Blue = inner / outer ring, yellow = rolling element. Drawn to scale from this part's own dimensions for selection reference only - not a manufacturing or assembly drawing.

Dimension table (mm / inch)

Symbol	Dimension	mm	inch
d	Bore diameter	105	4.1339
D	Outside diameter	190	7.4803
B	Inner-ring / bearing width	36	1.4173
r	Chamfer (min)	2.007	0.079

Notes

Weights are given in kg. Load ratings are shown in both the original catalogue units and the converted value (1 N = 0.2248 lbf). Data is provided for selection reference only - confirm against the latest official catalogue before ordering.

Main dimensions

Bore d (mm)	105
Bore d (in)	4.1339
Outside dia. D (mm)	190
Outside dia. D (in)	7.4803
Width B (mm)	36
Width B (in)	1.4173

Load ratings & speeds

Basic dynamic load rating Cr (lbs)	29900
Basic static load rating Cor (lbs)	23500
Limiting speed - grease (rpm)	3,400
Limiting speed - oil (rpm)	4,000
Factor f0	14.4

Weight

Weight (kg)	3.697

Mounting dimensions (fillets / shoulders)

Chamfer r (in)	0.079
Shaft shoulder da min (in)	4.606
Shaft shoulder da max (in)	5.024
Housing shoulder Da max (in)	7.008

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 1,100 rpm
4	33,250	64	970
6	22,167	216	3,273
8	16,625	512	7,758
10	13,300	1,000	15,152
15	8,867	3,375	51,136

Basic rating life per ISO 281: L₁₀ = (C/P)³ with C = 133,002 N. Hours = L₁₀ x 10⁶ / (60n). Life-modification factors for lubrication, contamination and temperature (a_ISO) are not included.

Source & traceability

Brand	NSK
Source catalogue	NSK inch product catalogue
Catalogue page	p.19 (dimensions) / p.20 (ratings)

Dimensions in inches and millimetres, load ratings in lbs.

Interchange - same dimensions, other brands

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
1221-M	FAG	Ball	105	190	36	75 kN	4.75
6221	FAG	Ball	105	190	36	141 kN	3.88
6221-2RSR	FAG	Ball	105	190	36	141 kN	3.73
6221-2Z	FAG	Ball	105	190	36	141 kN	3.99
QJ221-N2-MPA	FAG	Ball	105	190	36	233 kN	4.81
N221-E-M1	FAG	Cylindrical Roller	105	190	36	310 kN	4.63
N221-E-XL-M1	FAG	Cylindrical Roller	105	190	36	310 kN	4.63
NJ221-E-TVP2	FAG	Cylindrical Roller	105	190	36	310 kN	4.17
NJ221-E-XL-TVP2	FAG	Cylindrical Roller	105	190	36	310 kN	4.17
NU221-E-TVP2	FAG	Cylindrical Roller	105	190	36	310 kN	4.08

Same dimensions, same brand

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
1221	NSK	Ball	105	190	36	82.5 kN	4.43
7221B	NSK	Ball	105	190	36	30,400 lbs	4.4
BL221	NSK	Ball	105	190	36	39,200 lbs	4.173
221	NSK	Cylindrical Roller	105	190	36	45,100 lbs	4.051
HR30221	NSK	Tapered Roller	105	190	36	345 kN	4.51
HR30221J	NSK	Tapered Roller	105	190	36	62,900 lbs	4.509
7221	NSK	Precision / Angular Contact	105	190	36	172 kN	3.84
7221A5	NSK	Precision / Angular Contact	105	190	36	34,800 lbs	3.769

Nearby bore sizes

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
1221	NSK	Ball	105	190	36	82.5 kN	4.43
1321	NSK	Ball	105	225	49	169 kN	9.58
16021	NSK	Ball	105	160	18	57 kN	1.24
2221	NSK	Ball	105	190	50	120 kN	5.73
6021	NSK	Ball	105	160	26	16,300 lbs	1.592
6321	NSK	Ball	105	225	49	41,300 lbs	8.119
6821	NSK	Ball	105	130	13	4,440 lbs	0.313
6921	NSK	Ball	105	145	20	9,460 lbs	0.835

Request a quotation for 6221

Send us the quantity you need and we will come back with price and lead time, normally within 24 hours. Equivalent parts from other brands can be quoted at the same time.

Online enquiry form richard@bearingsfit.com WhatsApp +86 156 2149 6516